Vol. 44 No. 11 Nov , VDT ERP VDT ERP P100 P300 ERP P100 P300 ERP 2 2 A Proposal on an Evaluation Method towards the Development of a

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1 Vol. 44 No. 11 Nov , VDT ERP VDT ERP P100 P300 ERP P100 P300 ERP 2 2 A Proposal on an Evaluation Method towards the Development of a Human Interface with Less Visual Fatigue Tatsuhiro Kimura, 1 Yoshiaki Hayasaka, 1 Norihisa Segawa, 2, Kiyoyuki Yamazaki, 3 Yuko Murayama 2 and Masatoshi Miyazaki 4 In order to obtain a guideline for designing low-workload Human Interface (HI). We investigated assessment of visual fatigue induced by performing an interactive task as a model of HI software on personal computers utilizing measurement of Event Related Potentials (ERP) and accommodation. The ERP were measured in this study before and after a visual target detection task in healthy adult participants to assess visual fatigue of the central nervous system. As an index of accommodation, the ophthalmic near point was also measured using an accomodometer. As the experimental task, participants were instructed to click designated targets from a randomly arranged matrix of characters for one hour. All participants reported symptoms of visual fatigue after the task. From the averaged ERP waveform, P100 and P300 components were detected and their amplitudes and peak latencies were analyzed. Amplitude of the P100 component measured after performing the task was larger than that in the control condition. Near points after the task increased in comparison with those before the task. Results indicated that visual fatigue by the experimental task evoked both eye-strain and altered function of the primary visual cortex. Feasibility of applying the present method to a low-workload software development is discussed. 1 Graduate School of Software and Information Science, Iwate Prefectural University 2 Faculty of Software and Information Science, Iwate Prefectural University 3 Department of Bio-Medical Engineering, School of High-Technology for Human Welfare, Tokai University 4 Digitally Advanced Integrated Solution Laboratories 1. VDT Ltd. Presently with Graduate School of Information Science, Tohoku University 2587

2 2588 Nov HI Fig. 1 A model of the low-workload HI development procedure incorporating objective evaluation based on biomedical information analysis. 1) 5) 6) 7) HI 8) HI VDT HI 9) 1 HI Event Related Potentials: ERP VDT 3 VDT 10) Critical Flicker Frequency CFF 11) 12),13) ERP ERP P300 ERP ERP ERP HI 2 ERP 3

3 Vol. 44 No ERP HI 7 2. ERP mm ERP 14) S/N ERP 100 ms P ms P300 amplitude latency P100 15) P300 ERP 1 Nontarget Target 2 ERP Fig. 2 Example of ERP waveform. 2 ERP ERP 16) 17) ERP Iwasaki 1 VDT ERP P100 18) P300 P )

4 2590 Nov VDT ERP CRT 30 cm NP KOWA NP Fig. 3 The experimental task for visual fatigue. 4 Fig. 4 Experimental schedule. 19) 10 NP 4.4 ERP ERP ERP ERP ERP ten-twenty 20) Cz Pz ERP

5 Vol. 44 No Fig. 5 5 ERP Pattern reversal stimulus for ERP measurement. (a) 5 CRT (A) (B) 100 ms 200 ms (A) 100 ms 200 ms 4: ms P ms 120 P ms 30 ERP EOG EOG EOG P100 P300 ERP EOG EEG1A94 TEAC DR-M ) (b) 6 (a) (b) Fig. 6 Reproducibility of near point measurement. (a) Near point (disappearance), (b) Near point (appearance) (a) (b) (a) 0.87 (b) (a) (b) 100% 5.2 ERP P100 8 ERP P ERP P100

6 2592 Nov (a) (a) (b) 7 (a) (b) Fig. 7 Effect of the experimental task on accommodation before and after the task performance. (a) Near point (disappearance), (b) Near point (appearance). (b) 9 P300 (a) T (b) NT Fig. 9 Change of P300 amplitude before and after the task. (a) Target trial (T), (b) Non-target trial (NT). (a) T (b) NT (a) T (b) NT p < ERP P P300 8 P100 Fig. 8 Change of P100 amplitude before and after the task. p < ERP P300 ERP 200 ms T 100 ms NT 9 P300 NT T A NT/T 1 p < ERP 1 P100 P300 P100 P ERP 11 P100 P300 A NT/T ERP

7 Vol. 44 No Fig. 10 P300 A NT/T A NT/T of P300 amplitude before vs. after the task. (a) 1 P100 P300 ms Table 1 Mean and SD of ERP latencies (ms). 5.7 ERP P P300 A NT/T A NT/T r =0.71 (b) 11 ERP (a) P100 (b) P300 A NT/T Fig. 11 Relationship between the near point prolongation and ERP parameters. (a) vs. P100 amplitude, (b) vs. P300 A NT/T change. 6. VDT ERP ERP P100 ERP P300 NT T A NT/T 1 NT P300 T P300 P300 T NT P P300 A NT/T Fig. 12 Relationship between subjective mood of visual fatigue and P300 A NT/T change before and after the task. Kok NT P300

8 2594 Nov ) NT P300 NT P300 P300 A NT/T r =0.71 VDT 20 7 (a) (b) 10 A D E J 2 P100 P300 ERP 2 23) habituation 24) P300 A NT/T 1 habituation CFF ERP NP 12) VDT VDT ERP P300 A NT/T VDT HI ERP VDT )

9 Vol. 44 No HI ERP IT HI 7. HI HI ERP P100 P300 (1) ( 2 ) P100 (3) P300 (1) (3) 3 HI 1) Grandjean, E.: Ergonomics of VDUs: review of present knowledge, Ergonomics Aspects of visual Display Terminals, pp.1 12, Taylor and Francis Ltd., London (1980). 2) Dainoff, M.J.: Visual fatigue in VDT operators, Ergonomics Aspects of visual Display Terminals, pp.95 99, Taylor and Francis Ltd., London (1980). 3) Otberg, O.: CRTs pose health problems for operators, International Journal of Occupational Health and safety, pp (1975). 4) VDT Vol.16, No.20, pp.7 12 (1992). 5) Vol.55, No.5, pp (2001). 6) jp html 7) Vol.39, No.5, pp (1998). 8) NTT R&D, Vol.39, No.2, pp (1990). 9) 13 p.289 (2001). 10) VEP 2002 A (2002) (CDROM). 11) (1967). 12) VDT 40 pp (1988). 13) VDT paper Vol.37, No.8, pp (1985). 14) Cobb, W.A. and Dowson, G.D.: The latency and form in man of the occipital potentials evoked by bright flashes, J. Physiol., Vol.152, pp (1960). 15) Barrett, G., Blumhard, L., Halliday, A.M., et al.: A paradox in the lateralization of the visual evoked response, Nature, Vol.261, pp (1976). 16) Picton, T.W. and Hillyard, S.A.: Human auditory evoked potential II, Effects of attention, Electroencephalogr. Clin. Neurophysiol., Vol.36, pp (1974). 17) Donchin, E. and Coles, M.G.: Is the P300 component a manifestation of context updating?, Behavioral & Brain Science, Vol.11, pp (1988). 18) Iwasaki, T. and Kurimoto, S.: Eye-strain and changes in accommodation of the eye and in visual evoked potential following quantified visual load, ERGONOMICS, Vol.31, No.12,

10 2596 Nov pp (1988). 19) VISION, Vol.5, pp (1993). 20) Jasoer, H.: Ten-twenty electrode system of the International Federation, Electroencephalogr. Clin. Neurophysiol., Vol.10, pp (1958). 21) Vol.22, pp (1981). 22) Kok, A.: On the utility of P3 amplitude as a measure of processing capacity, Psychophysiology, Vol.38, pp (2001). 23) Kounin, J.S. and Doyle, P.H.: Degree of Continuity of a Lesson s Signal System and the Task Involvement of Children, Journal of Educational Psychology, Vol.67, No.2, pp (1975). 24) Karsten, A.: Psychische Sattigung, Psychol. Forschung, Vol.10 pp (1928). 25) VDT VDT Vol.27, pp (1985). ERP P300 CRT A B 2 13 A B A A 300 ms P300 P300 1/50 S/N ( ) ( ) ACM ERP ME Fig Schematic illustration of stimuli sequence of the oddball paradigm.

11 Vol. 44 No University College London 1990 Ph.D IEEE ACM OR ACM IEEE UNIX

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